Magnetic fixture for holding tool bits and the like



Sept,, 24, 1957 J. ANTON 2,807,759

MAGNETIC FIXTURE} FOR HOLDING TOOL BITS AND THE LIKE FiledAug. 11, 1954 2 Sheets-Sheet l IN VEN TOR. JOE ANTON AT TORNEY.

Sept. 24, 1957 J. ANTON 2,807,759

MAGNETIC FIXTURE FOR HOLDING TOOL BITS AND THE LIKE Filed Aug. 11, 1954 2 Sheets-Sheet 2 I l/l/ll/ll/ I ATTORNEY United States Patent MAGNETIC FIXTURE FOR HOLDING TOOL BITS AND THE LIKE Joe Anton, Fresh Meadows, N. Y.

Application August 11, 1954, Serial N 0. 449,153

2 Claims. (Cl. 317-162) This invention relates to improvements in a grinding fixture and is directed more particularly to the provision of a tool bit grinding fixture in which the bit or other member to be ground is mounted in a universally movable holder which is angularly settable in all planes.

Another object of the invention is the provision in a tool bit grinding fixture of a magnetizable socket means, and a ball-like member adapted to support a tool or hit to be ground, said ball-like member carrying means to secure the tool to be ground therein and also being adapted to be set angularly with respect to the horizontal and the vertical and adapted to retain a setting when said socket means is magnetized.

Yet another object of the invention is the provision in a device of the character described in a ball-like holder for tools to be ground having a passage therethrough into which the tools may be mounted and having bushings, the outside of which fits the passage and the inside of which may accommodate a tool which is smaller than the passage.

Other objects and advantages of the invention will be apparent to those skilled in the art upon a study of this specification and the accompanying drawings.

Referring to the drawings which are given by way of example to illustrate one preferred form of the invention:

Figure 1 is a side elevation of my new and improved tool bit grinding fixture showing a tool bit positioned therein;

Figure 2 is an elevational view taken along the line 2-2 of Figure 1;

Figure 3 is a sectional elevation taken along the line 33 of Figure 2;

Figure 4 is a plan view of the device;

Figure 5 is an elevation of the ball with a tool bit positioned in a passage therein;

Figure 6 is a view of the ball as seen along the line 6-6 of Figure 5; and

Figure 7 is a view of the ball as seen along the line 77 of Figure 5.

Referring now to Figures 1 to 4 inclusive, my new and improved device has a base portion 10 having a spheroidal socket 11 formed therein. The base 10 is comprised of a series of soft steel laminations 24 with a brass lamination 25 between each pair of adjacent steel laminations so that it may be used for example on a magnetic chuck such as that shown at 44 in Figure 3, and energized by either direct current or by alternating current. The base 10 may have an upstanding portion 26 adjacent to the rear edge thereof forming a support, the purpose of which will be presently described.

Supported by the base 10 and forming a working lit in the socket 11 is a metallic ball 12 formed of ferrous materials and which has a rectangular passage 13 extending therethrough to accommodate a tool bit 14 to be ground. The tool bit 14 may be retained in the passage 13 by means of a set screw 27 preferably of the Allen type wherein the head 28 is well below the periphery of 2,807,759 Patented Sept. 24, 1957 the ball. The base 10 has a hole 29 formed therein which gives access to the set screw 27.

The ball 12 has a horizontal or equatorial line 19 thereon, a second encircling line 20 which lies in a plane with respect to the equatorial plane 19. The ball also has a third encircling line 30 which is disposed in a. plane extending 90 with respect to the equatorial plane 19 and 90 with respect to the encircling line 20. Bordering the line 30, the ball carries graduations which represent angular inclinations. This series of graduations has its zero point on the line 20 and the series of graduations 15 are disposed along the line 30 as aforesaid.

The base 10 carries on its upper surface 31 a series of graduations extending from a zero line to a 30 line in either direction, the zero line coinciding with the encircling line 20 above described. The base may also carry a second series of graduations 22 which are similar to the graduations 21 so that a setting may be observed on the device from either side of the machine or the support upon which it is positioned. In other words, the two scales 21 and 22 are not absolutely necessary, as the device may be used with either one only but it has been found convenient to provide the two scales.

An upright 32 has a foot portion 33 which carries threaded holes 34 by means of which the foot portion 33 may be secured onto the base portion 26 by means of screws 35. The foot portion may have dowel holes therein aligned corresponding dowel holes in the portion 26 of the base 10 to accommodate dowel pins 36. The upright 32 has a portion 17 extending at a right angle thereto and which partially overhangs the ball 12 and which terminates along a line 16 which may normally coincide with the encircling line 20 on the ball 12. The portion 17 has a beveled face 37 which terminates in the surface 16 and this beveled face carries a series of graduations 38 which run for example from zero to 30 in each direction, the zero line normally coinciding with the encircling line 30. In order to have the graduations 38 terminate close to the ball 12, the undersurface of the overhanging portion 17 is in the form of an are 39 closely adjacent to the periphery of the ball 12.

By the arrangement described above, a tool bit such as the tool bit 14 may be positioned within the passage 13 and secured therein by means of the set screw 27. With the bit 14 so secured, the ball may be swung through horizontal or vertical or inclined angles to accurately obtain the desired angles on the tool bit after the same is ground. In each instance, the setting is made by swinging the ball in its socket 11 relative to the several scales and reference lines. After each setting the device may be positioned on a magnetic chuck or other device and thus a setting may be retained until the magnetizing force is shut oif. Of course, the device may be positioned on the magnetic device during the entire operation and the settings may be made with the magnetizing current shut off and then the grinding operations may be sequentially performed between each setting and while the magnetism maintains the setting.

With the arrangement shown in Figures 5 and 6, a rectangular bushing 40, the outside of which forms a working fit in the passage 13 may be provided, and the inside surface 41 thereof may be devised to accommodate a smaller tool bit such as the tool bit 42. The procedure is the same as that described above except that the bushing 40 should be provided with a clearance hole 54 for the screw 27 so that its inner end may actually engage the tool bit 42.

I have found that my new and improved device may be rapidly set to and retained in any desired angular relation with a grinding wheel for example and that with it, the grinding of the tool bit is much faster than hand grinding and that my device produces ground bits with more accurate angular surfaces than any other known form of tool.

Although I have herein shown and described by way of example one preferred embodiment of the invention, it will be understood that many changes may be made in the arrangements shown and described within the scope of the following claims.

I claim:

1. In a device of the character described, a laminated magnetizable base having a socket formed therein termimating in the upper surface thereof, a ferrous metallic ball resting on said base with its lower portion universally movable in said socket, a passage extending through said ball to accommodate an elongated object upon which an operation is to be performed, means to secure said object in said passage; a series of graduations horizontally disposed on said base and a cooperative line or indicator on said ball for setting said passage angularly about a vertical axis; a second series of graduations carried on said ball, and an upright member having an overhanging portion partially embracing the upper portion of said ball and having an extremity which forms an indicator line cooperating with the graduations in said second series for setting the inclination of said passage about a horizontal axis; a third series of graduations carried on said overhanging portion of said upright member, and a cooperative indicator line on said ball to facilitate the setting of said ball angularly about the axis of said passage; and means to magnetize said base for the purpose of holding said ball and the object carried thereby in any set position while an operation is performed on said object.

2. The invention according to claim 1 wherein all of said scales are visible from a point above said device.

References Cited in the file of this patent UNITED STATES PATENTS 1,343,751 Simmons June 15, 1920 1,677,889 Gairing July 24, 1928 2,539,289 Vavrin Jan. 23, 1951 FOREIGN PATENTS 581,480 Germany July 28, 1933 581,595 Great Britain Oct. 17, 1946 

